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Tropical Depression Sally

UPDATED
400 AM CDT Thu Sep 17 2020
LOCATION
50 MI SE OF MONTGOMERY ALABAMA
WINDS
30 MPH
PRESSURE
1000 MB
MOVING
NE AT 12 MPH

TROPICAL DEPRESSION SALLY STILL PRODUCING TORRENTIAL RAINS OVER

EASTERN ALABAMA AND WESTERN AND CENTRAL GEORGIA

KEY MESSAGES
ALERTS
HAZARDS
SUMMARY
DISCUSSION

1. Widespread flooding is expected from central Georgia through southeastern Virginia. Along the central Gulf Coast, most widespread moderate to major river flooding from the historic rainfall event will crest by the weekend, but rivers will remain elevated well into next week.


There are no coastal watches or warnings in effect.


Key messages for Sally can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC, and on the web at www.hurricanes.gov/text/MIATCDAT4.shtml

RAINFALL: Rainfall totals expected as Sally moves across the Southeast U.S. through Friday: Central Georgia: Sally will produce additional rainfall totals of 3 to 6 inches, with localized higher amounts, on top of 3 to 6 inches which has already fallen. Widespread flash flooding and minor to moderate river flooding is likely. Central to upstate South Carolina: 3 to 6 inches, with isolated amounts of 10 inches. Widespread flash flooding and minor to moderate river flooding is likely. Western to central North Carolina into southcentral and southeast Virginia: 4 to 6 inches, isolated amounts up to 8 inches. Flash flooding and widespread minor river flooding is likely.

STORM SURGE: Water levels will continue to recede through the day today.

TORNADOES: A couple of tornadoes may occur early this morning across southern Georgia and northern Florida. The threat of tornadoes will shift northeastward into eastern Georgia and much of the Carolinas today and tonight.

SURF: Swells from Sally will continue to affect the Gulf Coast from the Florida Big Bend westward to southeastern Louisiana through today. These swells are likely to cause lifethreatening surf and rip current conditions. Please consult products from your local weather office.


At 400 AM CDT (0900 UTC), the center of Tropical Depression Sally was located near latitude 31.8 North, longitude 85.7 West. The depression is moving toward the northeast near 12 mph (19 km/h), and a northeastward to eastnortheastward motion is expected into Friday. On the forecast track, the center of Sally will move across southeastern Alabama this morning, over central Georgia this afternoon and evening, and move over South Carolina late tonight into Friday.

Maximum sustained winds have decreased to near 30 mph (45 km/h) with higher gusts. Additional weakening is forecast during the next couple of days, and Sally is expected to become a remnant low by tonight or Friday morning.

The estimated minimum central pressure based on nearby surface observations is 1000 mb (29.53 inches).


Although the overall convective cloud and rain shield in satellite and radar imagery continues to erode, Tropical Depression Sally is still producing significant rainfall across east-central Alabama and west-central and central Georgia. Surface observations and Doppler radar data indicate that Sally has weakened to a 25-kt depression over southeastern Alabama. Sally will continue to weaken, and fairly rapidly at that, due to increasing friction and loss of convection owing to very hostile westerly to southwesterly vertical wind shear in excess of 40 kt. Sally will likely degenerate into a remnant low pressure system by tonight or early Friday, and merge with a frontal system over North Carolina by Friday evening.

Sally is moving northeastward or 055/10 kt. A northeastward to east-northeastward motion will continue for the next 36 hours or so as the cyclone moves ahead of a broad deep-layer trough over the northeastern United States. The official track forecast is downthe middle of the tightly packed NHC model guidance suite, and lies close to the previous advisory track and the consensus model HCCA.This is the last NHC advisory on Sally. Future information on this system, including the rainfall threat, can be found in Public Advisories issued by the Weather Prediction Center beginning at 10 AM CDT, under AWIPS header TCPAT3, WMO header WTNT34 KWNH, and on the web at http://www.wpc.ncep.noaa.gov

View storm archives
      Hurricane Sally Advisory 22
      CATASTROPHIC AND LIFE-THREATENING FLOODING OCCURRING OVER PORTIONS OF THE FLORIDA PANHANDLE AND SOUTHERN ALABAMA
      Hurricane Sally Advisory 21
      SALLY'S NORTHERN EYEWALL WITH HURRICANE CONDITIONS MOVING ACROSS THE GULF COAST FROM PENSACOLA BEACH FLORIDA WESTWARD TO DAUPHIN ISLAND ALABAMA
      Hurricane Sally Advisory 20
      SALLY CONTINUES TO STRENGTHEN AS HURRICANE CONDITIONS SPREAD ONSHORE THE GULF COAST FROM PENSACOLA BEACH FLORIDA WESTWARD TO DAUPHIN ISLAND ALABAMA
      Hurricane Sally Advisory 19
      HURRICANE CONDITIONS EXPECTED TO REACH PORTIONS OF THE NORTH-CENTRAL GULF COAST LATE TONIGHT AND EARLY WEDNESDAY
      Hurricane Sally Advisory 16A
      HISTORIC FLOODING IS POSSIBLE FROM SALLY WITH EXTREME LIFE- THREATENING FLASH FLOODING LIKELY THROUGH WEDNESDAY ALONG PORTIONS OF THE NORTHERN GULF COAST
      Hurricane Sally Advisory 16
      HISTORIC FLOODING IS POSSIBLE FROM SALLY WITH EXTREME LIFE- THREATENING FLASH FLOODING LIKELY THROUGH WEDNESDAY ALONG PORTIONS OF THE NORTHERN GULF COAST
      Tropical Storm Sally Advisory 10A
      SALLY FORECAST TO PRODUCE LIFE-THREATENING STORM SURGE, HURRICANE-FORCE WINDS, AND HEAVY RAINFALL ALONG PORTIONS OF THE NORTHERN GULF COAST STARTING LATER TODAY
LOCAL ALERTS
WEATHER
NEWS
TRAFFIC
Sources include nearest National Weather Service office, National Hurricane Center, and the Florida Public Radio Emergency Network (@FloridaStorms).
Sources include nearby emergency management agencies, FEMA, and your local NPR affiliate. 
Sources include the Florida Department of Transportation, Florida Highway Patrol and other nearby traffic information.

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